(* *)
(**************************************************************************)
+include "ground/xoa/ex_3_4.ma".
+include "ground/xoa/ex_4_5.ma".
+include "ground/xoa/or_5.ma".
include "basic_2A/notation/relations/pred_6.ma".
include "basic_2A/static/sd.ma".
include "basic_2A/reduction/cpr.ma".